3638539

Information

• Patent Grant
• 3638539

• References
• Source

• Patent Number

  3,638,539

• Date Filed

  Not available

• Date Issued

  Tuesday, February 1, 1972
  52 years ago

• CPC

  • E02F3/786 - having a vertical axis of rotation

• US Classifications

  • 404 - Road structure, process, or apparatus
  • 037 - Excavating
  • 172 - Earth working